closing feature #3770
Fixing of an authentication security problem that could in some case permit a user to usurp identity of an other user. This is almost an utopia case, but it is possible.
This problem can also make thinking the users on the fact that Silverpeas would not be a serious application.
To obtain the authentication mistake :
- logon successfully with an administrator
- after that, fill the URL address of the Web navigator : http(s)://[server host][: server port]/silverpeas/ (not click on disconnect)
- you are now on the login page. Now, logon with an other user that is not an administrator
- do you see what i saw ?
Merge branch 'ney-feature3770' of https://github.com/NicolasEYSSERIC/Silverpeas-Core into master
bug #4821 :  SilverpeasRole#isInRole method accepts now as parameters one or more role names

Conflicts:
	lib-core/src/main/java/com/stratelia/webactiv/SilverpeasRole.java
Merge branch 'master' of github.com:Silverpeas/Silverpeas-Core
closing feature #4609
removing useless code relative to export of attachments
with feature #4609, export should no more be relative to application settings because files are versioned or not (at their own level)
Merge branch 'master' of github.com:Silverpeas/Silverpeas-Core
fixing a regression relative to feature #4609
File sharing was broken...
catching Javascript exception when submitting search query if banner have not search input
closing feature #4574
making a lifting to result page
Merge branch 'master' into ney-feature4574-bis
closing feature #4574
now, by default, pertinence is no more displayed